<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
</head>
<body>
	<script type="text/javascript">
		// 二维数组
		let arr = [[1, 2, 3], ["h", "i"]]
		console.log(arr[0] [0])

		for(let i = 0; i < arr.length; i++){
			for(let j = 0; j < arr[i].length; j++){
				console.log(arr[i] [j])
			}
		}
	</script>
</body>
</html>